Rolled iron bar



H. GQQKEL. ROLLED IRON BAE. APPLICATION FILED AUG.2I| i919.

)1.%2269 Patmed July M, 31922,

M @SW7 1 i iid W'mswf Q i@ /QT MyW/mw? Y i y gggggm entre STATES HEINRICH GOCKEL, 0F NEWIED-ON-THE-R-HINE, GERMANY.

ROLL-ED IRON BAR.

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Application led August 21, 1919.

To all w 710m t may concern.'

Be it known that I, HEINRICH GooKnL, citizen oit Germany, residing at Rheinstrasse 73, Neuwied-on-the-Rhine, Germany, have invented certain new and useful Improvements in Rolled Iron Bars (for which have filed application in Germany, January 23, 1917, of which the following is a specification.

My invention relates to improvements in rolled iron bars or" the kind usually employed as girders and building iron trussed in concrete, and it consists in a particular mode of slitting the middle-leg or stay of the bar and of pulling asunder the slitted bar to an enlarged width, thereby endowng the same with an increased bearing power and, in case the improved slitting be employed with girders, to thereby obtain a better binding of the concrete to the iron skeleton.

The mode of slitting the middle-leg of girder-iron and of tearing the slitted bar asunder to an increased width is well known. The particular mode of locating the slits, according to my invention, essentially con sists in forming said slits by alternating rows of opposite direction with relation to the axis of the bar or girder, thereby causing the same to constitute broken lines. In pulling asunder a girder slitted in such a manner, triangular apertures are obtained in the iron. But by the pulling strain the oblique bars of the girder become stretched and in consequence, the pulling asunder must not be carried too far, otherwise the stays will be likely to break or, at least, be considerably reduced in strength. For such reason, according to this invention, the slits are cut alternately in opposite directions and obliquely to the axis of the girder, whereby the cutting line, when coherent, will form a broken line, the angle of which will take the place opposite the stay which remains in full between the ends of two parallel slits. By this means, on drawing asunder the girder to an enlarged width, a girder is obtained with lozenged apertures, in which the connecting stays are but very slightly subjected to a stretching strain, though the height of the girder is considerably increased. The final result is this, that a girder is obtained which gives greater bearing power combined with great lightness of weight.

A further considerable advantage of girders of such kind is obtained in employing a double arrangement of slits, whereby each Specification of Letters Patent.

Patented July il, i922.

Serial No. 319,042.

slit produces a tongue, which is separated in the angle of the slit. This allows ot permitting the tongues or strips of metal formed to cohere with the main stay of the girder at one of their ends, while the other end may be bent outward. On bending one end to the sides of the stay alternately, one to the right side and one to the left, the rolled iron will be still better bound into the concrete. For the same purpose double slits of the kind may be employed also with other arrangements of slits, for instance with straight slits as described before, cut in parallel rows.

To make my invention perfectly understood, I will now proceed in describing the same with reference to the accompanying sheet of drawings, in which- Fig. l represents a cross-section of the girder employed to support a ceiling contiguous to both sides of the girder.

Fig. 2 is a side elevation ot the slitted girder, showing, on the lett, the structure before the slitted member is extended vertically, and, on the right, the parts in the position they assume after the blank has been extended vertically.

Fig. 3 is a horizontal section and Fig. 4- a transverse vertical section of the girder.

From Fig. 2 it will be evident, that the slits v1 of the rolled iron girders a form broken or angular lines, the angle of which is placed opposite the stay or plain portion between the ends of two angular slits' of the following row of slits 2T. The said slits z' are cut in double arrangement and the two legs of each angular slit z' are cut at a roofshaped angle with relation to the transverse axis of the girder, the apex of the upper range of slits being directed upward, while the apex of the lower range of slits is' directed downwards. On pulling the girder asunder in the vertical directions, as shown on the right side of Fig. 2, the height of the girder will be increased, as shown, the two parallel long sides of each slit will be torn into the triangular shape and the strips of metal c", separating the slits t', will be straightened or stretched, the middle portion of said strips c, then, will be bent outward, one portion to the right and the other to the left, keeping their connection with the girder at the respective end.

Above the slits 1I stamp from the met-al tongues or strips (Z, which tongues I bend out to both sides alternately, thereby allowing the concrete to pass' through the holes c.

The said tongues or strips el as Well as the metal strips t" serve to improve the trussing b of concrete, engaged between them to support the ceiling. They intercept or take up the strains acting transversely to the length of the girder.

In Figure l, Z) represents concrete into which the iron har or girder is set, h` being reinforcing bars therein. Figure 3 shows in horizontal section the girder in extended position, While Figure L shows the disposition of the parts thereof, as seen in vertical cross section.

I claim as my invention:

l. An iron bar provided with a body portion slitted upon angular lines With the slits alternately disposed, and overlapped and arranged in rows inclined to the longitudinal axis of the bar.

2- A bar in accordance with claim 1 wherein the slits have their intermedial connecting strips with one end connected to the main side and their outer ends bent to alternate sides.

3. A bar in accordance With claim 2 Wherein the apex of one row of slitsis turned in one direction and that of the other row turned in the opposite direction.

-In testimony whereof I aliX my signature in presence of tWo Witnesses.

` HEINRICH GOCKEL.

IVitnesses:

HEINRICH SoHi'rBnLs, JoHANNnTTn Hor. 

